Conveying Feature Tags with the Session Initiation Protocol REFER Method
RFC 4508, “Conveying Feature Tags with the Session Initiation Protocol REFER Method”, is a Proposed Standard document published in May 2006 by O. Levin, A. Johnston. It has since been updated by RFC 8217. The canonical text is published by the RFC Editor.
Abstract
The SIP "Caller Preferences" extension defined in RFC 3840 provides a mechanism that allows a SIP request to convey information relating to the originator's capabilities and preferences for handling of that request. The SIP REFER method defined in RFC 3515 provides a mechanism that allows one party to induce another to initiate a SIP request. This document extends the REFER method to use the mechanism of RFC 3840. By doing so, the originator of a REFER may inform the recipient as to the characteristics of the target that the induced request is expected to reach. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 4508 is hosted at rfc-editor.org. Available in TXT,HTML.
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